Baseball, Jazz, War... and now "The National Parks: America's Best Idea."

"In Europe, you had the Roman coliseum or Notre Dame or the Cologne cathedral, but we didn't have anything like that in America," said Dayton Duncan, who wrote the script and authored the companion book, to be published by Alfred Knopf. "But we did have these spectacular natural landscapes that were as unique and ancient as anything in the Old World. But unlike in Europe, they did not belong to monarchs or nobility. They belong to everyone."